knuckle
Americannoun
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a joint of a finger, especially one of the articulations of a metacarpal with a phalanx.
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the rounded prominence of such a joint when the finger is bent.
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a joint of meat, consisting of the parts about the carpal or tarsal joint of a quadruped.
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an angle or protrusion at the intersection of two members or surfaces, as in the timbers of a ship or in a roof.
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a cylindrical projecting part on a hinge, through which an axis or pin passes; the joint of a hinge.
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(in a wire mesh) a bend in a wire crossing another wire.
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(on a chair arm) one of the ridges left at the front end by longitudinal flutes carved to accommodate the fingers.
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Nautical. a pronounced edge formed by a change in the form of the shell of a hull.
verb (used with object)
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to rub or press with the knuckles.
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Marbles. to shoot (a marble) from the thumb and forefinger.
verb phrase
noun
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a joint of a finger, esp that connecting a finger to the hand
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a joint of veal, pork, etc, consisting of the part of the leg below the knee joint, often used in making stews or stock
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the cylindrical portion of a hinge through which the pin passes
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an angle joint between two members of a structure
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informal approaching indecency
verb
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(tr) to rub or press with the knuckles
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(intr) to keep the knuckles on the ground while shooting a marble
Other Word Forms
Derived Forms
Inflected Forms
Nouns
Participles
Conjugated Forms
Present
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knucklesimple
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knucklessimple
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have knuckledperfect
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has knuckledperfect
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am knucklingprogressive
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are knucklingprogressive
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is knucklingprogressive
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have been knucklingperfect progressive
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has been knucklingperfect progressive
Past
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knuckledsimple
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had knuckledperfect
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was knucklingprogressive
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were knucklingprogressive
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had been knucklingperfect progressive
Future
Etymology
Origin of knuckle
1325–75; Middle English knokel (akin to Dutch kneukel, German Knöchel ), diminutive of a word represented by Dutch knok, German Knochen bone; see -le
Explanation
Your knuckles are the joints in your fingers that are farthest from your fingernails. When you clench your hand into a fist, your knuckles are especially prominent. A knuckle is the part of your hand that makes it possible to move a finger freely, and if someone offers you a "knuckle sandwich," you should politely decline, since they're actually planning to make a fist and punch you in the mouth. To knuckle is to rub with the knuckles, like when you knuckle a bit of sand out of your eye. The root of knuckle is the Proto-Germanic knuk-, "bone."
Vocabulary lists containing knuckle
"LAFFF"
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"Modern Automotive Technology," Vocabulary from Section 11
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
See Examples For:
Then again, who among us hasn’t requested a parade of knuckle sandwiches with our cake and candles?
From The Wall Street Journal ● Jun. 15, 2026
Instead, attackers fill the space up to the ceiling, forming what I can only describe as a Dagwood knuckle sandwich.
From Los Angeles Times ● Jun. 11, 2026
This kit includes everything you need to make eight luxurious rolls: two pounds of Maine knuckle and claw meat, eight open-top buns, a half-pint of lemony mayo, and the butter to toast the rolls in.
From Salon ● Dec. 4, 2025
"So when my knuckle is away from the body, I'm not anchoring or touching any part of my body and I know I'm within the rules."
From BBC ● May 27, 2025
He scratches his nose with his knuckle, laughs uncomfortably, and leaves me alone with the shoe box.
From "Starfish" by Akemi Dawn Bowman
When it looked like my knuckles would punch holes in it, I plopped it down.
From The Wall Street Journal ● May 22, 2026
Deulofeu squeezes each hand into a fist and crunches his knuckles together to replicate his right knee.
From BBC ● Feb. 15, 2026
“Fingers bruised from lifting boxes on the warehouse floor, palms calloused from delivery bike handlebars, knuckles scarred with kitchen burns: These are not hands that have been allowed to hold power,” he said.
From Salon ● Nov. 6, 2025
Combatants try to get any edge they can in the contests, which can be painfully hard on the knuckles.
From Barron's ● Oct. 17, 2025
His forearms were hairy, and he even had tiny hairs on his knuckles.
From "Summer of the Mariposas" by Guadalupe García McCall
However, England's high-quality bench knuckled down, earned territory and, after George Ford had slotted a penalty, Roebuck went over to choruses of 'Swing Low, Sweet Chariot'.
From BBC ● Nov. 15, 2025
Yet, when faced with adversity, Adams never knuckled up for any fights on principle, choosing only to take the easiest and most comfortable way out.
From Slate ● Sep. 29, 2025
I only knuckled down on him 10 jumps from the wire because there was somebody above the wire in the starter’s stand.
From Los Angeles Times ● Apr. 30, 2023
Boyd scored midway through the first period, beating Stalock on a shot from the right circle that knuckled off Chicago defenseman Ian Mitchell’s stick.
From Seattle Times ● Feb. 28, 2023
Once I knuckled down to learn it, it was just another type of acting.
From "The Name of the Wind" by Patrick Rothfuss
Writing for the Sun on Sunday, Starmer described the strategy as "the most ambitious yet honest delivery plan in a generation" as the government was "knuckling down" on delivering its election promises.
From BBC ● Dec. 1, 2024
Fowler scored his career-best 43rd point with a goal in the first period on a knuckling shot that threaded a path among three Anaheim teammates.
From Washington Times ● Mar. 24, 2023
They may be white knuckling it because they live in perpetual fear of someday failing to measure up.
From Seattle Times ● Dec. 26, 2022
“Or I had people calling and saying, ‘I just need to talk with you because I’m white knuckling my way through things that I could do before the pandemic.’
From Washington Post ● Apr. 29, 2022
“Page,” he said, as the small boy trotted in, knuckling his eyes.
From "The Once and Future King" by T. H. White
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
